Fuel Command Center (#40003) Installation Instructions

The FiTech Fuel Command Center is the ultimate in afuel delivery system. It not only is the most efficient wayto supply fuel to your FiTech EFI system, it also greatlysimplifies the installation process. It is a returnless sys-tem which effectively eliminatesthe need for a return line.

It uses your stock fuel tank,stock carbureted fuel pump, andstock inlet fuel line. You simplydisconnect the fuel line that runsfrom your pump to your carbure-tor and replace it from the pumpto the Fuel Command Centerwhich can be mounted in the en-gine compartment. The only addi-tional plumbing required is to runa line from the Fuel CommandCenter to the inlet port on theFiTech Go System EFI. Most nec-

essary hose, hose ends, and fittings are supplied. The Fuel Command Center contains an internal float

mechanism that shuts off the fuel flow once the sumptank is filled. A 340 L/PH high pressure fuel pump is sub-

merged in the fuel in the sumptank. A submerged pump runsquieter and cooler and lasts longerthan external fuel pumps.

The Fuel Command Center iscapable of providing enough fuelfor engines producing up to 800HP but is still suitable to be usedon engines making as little as 200HP.NOTE: It is very important that acarbureted fuel pump is used tofeed the Fuel Command Center. (8PSI maximum).

40003 Kit Contents

(1) Sump Tank Assembly (1) 340 L/PH Fuel Pump(1) 30 Micron Inline Fuel Filter5' of EFI -06 Fuel Hose (Push Lock)(2) -06 AN 90° Hose Ends (Push Lock)(3) -06 AN Straight Hose Ends (PushLock)

(1) -06 AN 45° Hose End (Push Lock)(4) 5/16-18 x 1" Hex Head Bolts(4) 5/16 Flat Washers(4) 5/16-18 Lock Nuts(1) 0-15 PSI Fuel Pressure Gauge(1) 0-100 PSI Fuel Pressure Gauge(1) Hose Clamp

The Fuel Command Center is designed to be used only with FiTech EFISystems that include the Pulse Width Modulation (PWM) feature.

Fuel Filter

Plug the fuel return portwith the supplied plug.Also plug the two inletports marked "A" with thesupplied plugs. You canuse any of the three inletports but plug the two thatare not used.

Out

Out

Out

In

Plumbing Schematic for Fuel Command Center - Fuel Delivery Kit #40003

The Fuel Command Center is the ultimatefuel delivery system. Use your stock fueltank, fuel line to the pump and the stockpump. Plumb a fuel line from the stockpump to the Command Center using lowpressure hose and connections. Thenplumb a high pressure line (with inlinefilter) to the EFI Throttle Body. No returnline is required.

Some fuel pumps have nipplesfor the inlet and outlets. If yourpump is this style, slip the fuelhose over the nipple and se-cure with a hose clamp.

Fuel Pressure Regulator. Readthese instructions on whetheror not you need to connect avacuum line to this nipple.

-06 AN Adapter Fittings are available to fit many stock fuelpumps. Russell #640330 fits Ford, Chrysler, and early

Chevy with 1/2-20 inverted flare. Russell #640380 fits1970& later Chevy fuel pumps with 5/8-18 inverted flare.

Vent Hose Connect to vent lineport on fuel tank orplumb a new line ifno vent line exists.

Alternate StyleStock Fuel Pump

Stock Fuel Pump

0-100Gauge

0-15Gauge

Fuel CommandCenter

"A"

"A"

Figure 1

FiTechFuel Injection

TM

Locate a suitable spot to install the Fuel Command Center.It can be mounted on the firewall, inner fender panel, ordown on the frame if you have room. Five feet of fuel hoseis supplied with this kit so the Center needs to be withinfive feet of the throttle body. Make sure you choose a po-sition where the fuel hose can be routed without gettingtoo close to the exhaust manifolds or any moving parts.

The supplied inline filter will be installed in the fuel linethat runs from the Command Center to the EFI throttlebody, so plan the routing of that line so there is a place toconveniently install the filter. You must also install a conventional carburetor style (low

pressure) filter between the fuel pump and the Fuel Com-mand Center to avoid dirt particles clogging the needle andseat inside the Command Center.

The Command Center must be installed in the uprightposition. This is important for proper operation.

Using the two mounting brackets that secure the Com-mand Center in place as templates, mark spots to drill fourholes. Drill four 11/32" diameter holes and secure the Com-mand Center in place with the supplied bolts, nuts andwashers. If your mounting surface is not flat, use washersor spacers when mounting the Command Center so that itis in the vertical position.

Determine your necessary hose lengths. You will needthree hose lengths. One will run from the stock fuel pumpto the Command Center with a user-supplied filter.. A sec-ond will run from the Command Center to the Filter and thethird runs from the Filter to the fuel injection Throttle Body.Cut the ends of the hose with a very sharp blade and makesure the end cut is square and clean. To install the hoseends, clamp the hose end in a vise using something to pro-tect the finish. Do not overtighten the vise and damage thehose end. Coat the hose end and hose liberally with WD-40 or some other lubricant. Push the hose onto the hoseend making sure it fully bottoms out. Do not mix the sup-plied hose or hose ends with any other brand of hose orhose ends.

Your Command Center Kit includes several styles ofpush lock style hose ends. We recommend the followingconfiguration of these hose ends. You may find that yourparticular installation may require a different configuration.If you need additional hose or hose ends you can orderthem direct from FiTech. Hose and Hose Ends Usage

The hose that goes from the Command Center to theFuel Filter should have a 90° hose end on the CommandCenter end and a straight hose end on the filter end. Thehose that runs from the Filter to the throttle body shouldhave a straight hose end on the filter end and a 45° hoseend on the throttle body end.

The hose that goes from the stock fuel pump to theCommand Center should have a straight hose end on thefuel pump end and a 90° on the end that feeds the Com-mand Center. This is just a suggested starting point. Care-fully plan your plumbing and fitting requirements. TheFiTech throttle body has three inlet ports so pick the onethat best suits your layout. Also remove the supplied returnfitting and plug the return port on the throttle body with thesupplied port plug. See Figure 4 on last page of these in-structions. Command Center Vent Port - IMPORTANT

The Vent Port is a critical part of the installation andthese instructions must be followed for a safe and properoperation of the system. The Command Center has a VentPort complete with a Rollover Valve. A fuel rated hose orhard line must be routed from the Vent Port back to the fueltank. Many vehicles are already equipped with a vent lineto the tank. You can tee into the existing line if your vehicleis so equipped. DO NOT run a vent line from the CommandCenter to the OPEN AIR in the engine compartment orpointed to the ground or to the air cleaner. Fumes from theVent Port are dangerous and must be properly routed. Youmay need to change the pipe fitting on the Command Cen-ter to suit the line diameter you use. If no existing vent lineto the tank exists, you must plumb your new line to a pointabove the fuel level of the tank at the top or in the filler neck.Proper routing of a vent line is not an option. It is amandatory part of the installation. If the vent is not prop-erly routed to the gas tank FiTech cannot be responsible forany fires or other issues resulting from improper vent rout-ing or failure to follow these instructions.

Determining Inlet Port On Throttle BodyThe Fuel Command Center is a returnless system. On

your FiTech Go EFI System throttle body there are four fuelports. (See figure 4) One is marked "Return." Plug that portwith one of the plugs that came with the EFI kit. Select anyone of the remaining three ports as your inlet port. Installone of the supplied -06 AN fittings in the port that you haveselected to use and install the supplied plugs in the othertwo ports. You will have one -06 AN fitting left over. (Thisfitting is required when using the 40005 Fuel Delivery Kitwhich is a return style system.)

Grounding the Command Center Run a ground wire from the negative (-) terminal on the

Command Center to a metal grounded part of the car. Ifyour battery is close to the Command Center you can attachthe wire directly to the battery ground cable. Without agood ground the pump will not run. A self tapping metalscrew may be needed to attach the wire end to a sheetmetal part of the car. Make sure any paint is removed

Installing the Fuel Command Center

so the ground wire makes contact with bare metal.Wiring the Command CenterYour FiTech EFI system has a large orange wire that is

part of the group of wires from the ECU. This wire has tobe connected to the positive (+) terminal on the Com-mand Center. Do not connect this wire to Command Cen-ter after the proper length has been determined. Thesystem must be primed before this wire is connected oth-erwise you risk damaging the pump. Place some tapeover the exposed end of the wire to avoid accidental con-tact with a metal surface.Plumbing the Stock Fuel Pump to the Command CenterSome stock pumps have a steel tube as the pump outlet.If your pump is so configured you can slip one end of thesupplied -06 hose over the tube and secure it with a hoseclamp. Other style pumps have a threaded port for theoutlet. If the port has a fitting that has a barbed end wherea stock fuel hose is clamped to it, you can use that fitting.If your pump has a hard line coming from the outlet portof the pump, remove the threaded fitting and replace itwith a steel adapter fitting. There are two fuel pumpadapter fittings available. They both provide a male -06AN thread that you can connect a fuel hose to with oneof the supplied -06 hose ends. The fitting with 1/2-20threads fits Ford, Chrysler and pre-1970 Chevys. The fit-ting with 5/8-18 threads fits 1970 and later Chevys. Edel-brock pumps may require a special adapter fitting(available from Russell Performance).

If your pump has an outlet port with 3/8-NPT or 1/2-NPT ports you will need to acquire an adapter fitting withthose threads on one end and -06 AN threads on theother. Adapter fittings are available from any fitting sup-plier such as Russell, Earl's or Aeroquip.Plumbing the Command Center to the Throttle BodyYou have previously determined the lengths required forthe hoses from the Command Center to the Fuel Filterand from the Filter to the Throttle Body. Install thosehoses. The supplied fuel filter is light enough that it's weight

can be supported by the fuel hose. However, you can se-cure it with an Adel clamp or a tie wrap if desired. (Clampor tie wraps are not included in this kit.)Fuel Pressure RegulatorThe Command Center has a built-in fuel pressure regu-lator mounted on the top. This regulator is not adjustablebut is pre-set to provide 58 PSI of fuel pressure to theEFI system. The regulator has a vacuum nipple on it.When the Command Center is used with a Fitech Go EFISystem, this nipple is left open unless you are using theCommand Center on an engine with a blow through su-

percharger or turbocharger. In that case a vacuum hoseshould be run from the regulator to non-ported vacuumnipple on the throttle body. See Figure 2.

The Command Center can be used with any fuel in-jection system. Depending upon the design of the unitbeing used, different connections need to be made to thevacuum nipple on the regulator. If the throttle body in thesystem you are using has the injectors under the throttleplates, you need to connect a vacuum hose to a portednipple on the throttle body. If the injectors are above thethrottle plates, leave the nipple open. On a port injectionsystem where the injectors are in the manifold, connecta vacuum line to a ported nipple on the throttle body. Onan engine with a Roots supercharger a vacuum connec-tion should be made between the regulator and the throt-tle body if the injectors are under the throttle blades. Ifthe injectors are above the throttle blades (which includesFiTech EFI systems) then leave the nipple port on the reg-ulator open.

Note that 43.5 PSI (3 BAR) regulators are availablefrom FiTech when the Fuel Command Center is used withother aftermarket EFI systems that require this type ofregulator. Fuel Pressure Gauges on Sump TankThe inlet gauge will show you the fuel pressure comingfrom your stock fuel pump. Do not use a pump that putsout more than 8 PSI. If your input reading is more than8 PSI you will need to install a fuel pressure regulator be-tween the fuel pump and the Command Center. The outletgauge will show you the fuel pressure being supplied tothe EFI which will be in the 58 PSI range. Priming the Command CenterReconnect the negative battery cable. Do not connect theFuel Command Center orange wire at this time. This is toavoid having the engine start during the priming proce-dure. Turn ignition key to the "ON" position and crank forten seconds. Turn key to the "OFF" position and wait 30seconds. Repeat this procedure a second time to fill thesump tank. This procedure allows your stock fuel pumpto pump fuel to the Command Center but the CommandCenter is not pumping fuel to the EFI throttle body.

Check entire fuel system for any leaks before attempt-ing to start the engine.

1. Be sure to install a carburetor style fuel filterbetween the stock fuel pump and the FuelCommand Center.2. Do not conect orange wire until CommandCenter has been primed. CAUTION - Live wire.3. Check all connections for leaks.

FiTechFuel Injection

TM

FiTech Fuel Injection12370 Doherty Street • Riverside, CA 92503

Tech Phone: 951-340-2624www.FiTechEFI.com

INLET

INLET

INLET

RETURNPlug all unusedfuel ports.

Figure 4

LEFT - The FiTech Go EFI Throttle Body has (3) Inlet Ports and (1) ReturnPort. The Return Port is plugged when using the Fuel Command Center.

Figure 5

Complete Command Center Kit #40003 shown.

Roots type Superchargers Only:Plug the indicated vacuum port with a #10-32set screw which will thread directly into the

hole. Use Red Loctite to seal the threads. Con-nect boost reference hose to 3/16" nipple "A"

For Unblown or Blow-through Only:Use nipple for boost gauge or boost reference.

Use zip-tie to retain hose on nipple.

AFigure 2 Inlet

Outlet

ElectricalTerminals

Vent

0-15 Inlet FuelPressure Gauge

Fuel PressureRegulator

Sump Tank Component ofFuel Command CenterFuel Delivery System

Float Adjust-ment Screw

0-100 Outlet FuelPressure Gauge

Figure 3

IMPORTANT NOTE: The fuel tank on your ve-hicle must be vented to avoid pressure build-ing up inside the tank. Do not attempt toinstall and operate an EFI system without aproperly vented fuel tank.